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Transformaciones de fase reversibles en una red de coordinación diamondoide de doble pared con una isoterma
Xia Li1, Debobroto Sensharma1, Leigh Loots2
1Department of Chemical Science, Bernal Institute, University of Limerick, Limerick V94 T9PX, Republic of Ireland.
Journal of the American Chemical Society
|June 21, 2024
Resumen
Los investigadores desarrollaron un nuevo material metálico orgánico flexible (FMOM) llamado X-dia-6-Ni para el almacenamiento de gas natural adsorbido (ANG). Este material muestra una alta absorción de metano y capacidad de trabajo, lo que lo hace prometedor para aplicaciones eficientes de almacenamiento de ANG.
Área de la Ciencia:
- Ciencias de los materiales
- Química
- Ingeniería Química
Sus antecedentes:
- Los materiales metálicos orgánicos flexibles (FMOM) con isotermas escalonadas son prometedores para mejorar la capacidad de trabajo en el almacenamiento de gas natural adsorbido (ANG).
- Sin embargo, pocos de los más de 1000 FMOM conocidos logran la absorción de metano (>150 cm3/cm3) requerida para el almacenamiento práctico de ANG en las condiciones pertinentes (65 atm, 298 K).
Objetivo del estudio:
- Sintetizar y caracterizar un nuevo FMOM con alta capacidad de almacenamiento de metano.
- Investigar las transformaciones estructurales y las propiedades de absorción de gases del nuevo material para posibles aplicaciones de ANG.
Principales métodos:
- Síntesis de un nuevo ligando de enlace azoico (L) y su uso para crear la red diamondoide de doble pared e interpenetrada X-dia-6-Ni.
- Caracterización mediante difracción de rayos X monocristalino (SCXRD) y difracción de rayos X en polvo de temperatura/presión variable (XRD).
- Mediciones de la absorción de gases (N2, CO2, CH4) a bajas temperaturas y altas presiones.
Principales resultados:
- El X-dia-6-Ni presenta transformaciones estructurales reversibles entre las fases de poro estrecho (β) y de poro grande (γ) inducidas por la adsorción de gases o líquidos.
- El material presenta isotermas escalonadas de tipo F-II para el N2 y el CO2 con altas absorciones de saturación (422 cm3/g y 401 cm3/g, respectivamente).
- El X-dia-6-Ni logra una absorción significativa de metano (200 cm3/cm3 a 65 atm, 298 K) y una alta capacidad de trabajo (166 cm3/cm3 entre 5-65 bar, 298 K), clasificándose entre los mejores FMOM, especialmente aquellos con isotermas Tipo F-II.
Conclusiones:
- El nuevo FMOM, X-dia-6-Ni, demuestra capacidades excepcionales de almacenamiento de metano debido a su estructura única y transformaciones reversibles.
- Su alta capacidad de trabajo y el isotérmico tipo F-II lo convierten en un candidato líder para sistemas eficientes de almacenamiento de gas natural adsorbido.
- El estudio pone de relieve el potencial de diseñar FMOM con dinámicas estructurales específicas para aplicaciones de almacenamiento de gas optimizadas.
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